Why there is still so many Lorries on the bridge...

Inspite of the rules implemented to ban lorries and big transport to use the Penang bridge during peak hour, I still see so many lorries on the bridge during that peak hour :(
The initial few days after the implementation, I did noticed less slow moving vehicle using the bridge and police was there to control the traffic...But after a while, i guess those driver start to not follow the instruction.
Well, why bother to follow the rule, if there is no police to catch you and there is no any fine for those who disobey the rule, isn't it? Since the government enforced this rules, i never hear about what's the fine if those driver validated the rules.....
So, the conclusion is, this new rules doesn't really help to improve the traffic condition at Penang bridge :(